snatcher mixed up mp3

have noticed that the mp3 file are not in order. example: the 20 mp3 is supposed to be played at the begining of the game(when gillian is in turbocycle). do I reassign the numbers on the mp3 files or does gens recognize the correct file. the game gets stuck at the point previosly mentioned. I have clipped and modified the mp3 as recommended by this site but the sounds dont come out at this scene and the game freezes. please help anyone. also I have all the files mp3 and iso in one folder is that all i need to do or do i have to combine them somehow?